Comparison of Surface Solar Radiation Reanalysis Data and Observations over China

Wang Dan; Sheng Lifang; Shi Guangyu; Che Huizheng

Vol.23, NO.6, 2012

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2012 > 23(6): 729-738

Wang Dan, Sheng Lifang, Shi Guangyu, et al. Comparison of surface solar radiation reanalysis data and observations over China. J Appl Meteor Sci, 2012, 23(6): 729-738.

Citation:

Wang Dan, Sheng Lifang, Shi Guangyu, et al. Comparison of surface solar radiation reanalysis data and observations over China. J Appl Meteor Sci, 2012, 23(6): 729-738.

Wang Dan, Sheng Lifang, Shi Guangyu, et al. Comparison of surface solar radiation reanalysis data and observations over China. J Appl Meteor Sci, 2012, 23(6): 729-738.

Citation:

Wang Dan, Sheng Lifang, Shi Guangyu, et al. Comparison of surface solar radiation reanalysis data and observations over China. J Appl Meteor Sci, 2012, 23(6): 729-738.

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Comparison of Surface Solar Radiation Reanalysis Data and Observations over China

1.
Shaanxi Meteorological Service Center, Xi'an 710014
2.
Key Laboratory of Physical Oceanography of Ministry of Education, Ocean-atomosphere Interaction Laboratory of Ocean University of China, Qingdao 266100
3.
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
4.
Key Laboratory for Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, Beijing 100081

Received Date: 2011-12-13
Rev Recd Date: 2012-09-18
Publish Date: 2012-12-31

Abstract

Abstract

Comparison of surface solar radiation data of NCEP/NCAR, NCEP/CFSR reanalysis data and data from stations and marine observations are conducted to check whether reanalysis data can reflect the characteristics of surface solar radiation over China. The results show that NCEP/NCAR reanalysis data are less reliable before 1979, but both NCEP/NCAR and NCEP/CFSR reanalysis data are high reliable after 1979, and the reliability is higher in east and low latitude areas than that in west and high latitude areas over China. Because the daily mean data calculated by six-hour reanalysis data is lower than real data over China, it is reasonable to calculate the daily data by excluding the case of zero observation to minish the deviation.Long-term average errors between NCEP/NCAR, NCEP/CFSR and station observations of surface solar radiation are 10.37 W·m^-2 and-42.68 W·m^-2 in Chinese Mainland from 1979 to 2009, with standard deviation of absolute errors being 12.31 W·m^-2 and 4.19 W·m^-2. Average errors between NCEP/NCAR, NCEP/CFSR and marine observations of surface solar radiation are-161.19 W·m^-2 and-179.66 W·m^-2 over the sea during marine observing, with standard deviation of absolute errors being 37.07 W·m^-2 and 35.36 W·m^-2. The surface solar radiation from both NCEP/NCAR and NCEP/CFSR reanalysis data are bigger than station observations along the Yangtze River Valleys around Chongqing, where the biggest deviation appears.This maybe due to the fact that cloudiness data from reanalysis are smaller than observations here. Since the NCEP mode doesn't consider aerosols, it has also induced the bigger deviation of surface solar radiation between reanalysis data and observations.Besides, Chongqing is a mountainous region, whose terrain shelter influences surface solar radiation. It should increase surface solar radiation from 18% to 63%, when reanalysis data are used on the Yangtze River Valleys. There is some false phenomenonin long-term variation of surface solar radiation from reanalysis data. For example, a false upward trend exists notably in NCEP/NCAR reanalysis data before 1979 and the false extreme value of NCEP/CFSR reanalysis data appear in 1998. To some extent, the reanalysis data can be used for study of the surface solar radiation in Chinese Mainland. And the temporal and spatial distribution characteristics of surface solar radiation can also be reflected over the sea. For the deviation and false phenomenon of reanalysis data, more attention should be paid when using them in long-term climatological diagnosis. Compared with surface solar radiation from land station observation, there is a big deviation between the marine observations and the reanalysis data. This may due to the lack of marine observations, which will confine the evaluation and development of NCEP mode. Besides, the sea data used are constructed from marine observations from 2006 to 2007. For its insufficient sample, the data quality of surface solar radiation from NCEP/NCAR and NCEP/CFSR reanalysis data need to be studied further over the sea.
- surface solar radiation;
- station observations;
- reanalysis data;
- data quality

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References(36)

Figures and Tables

图 1 气象观测站点分布图 (■所示站点是云量、降水、相对湿度、风速、日照时数等资料缺测的台站),

(a) 大陆地区站点分布, (b) 海上观测区块划分及邻近陆上站点分布

Fig. 1 Distribution of meteorological observation stations (■ denotes the station has no observation of cloud, precipitation, relative humidity, wind speed and sunshine duration) (a) distribution of stations in Chinese Mainland, (b) marine observation areas and land stations close to them

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Fig. 2 Spatial distribution of solar radiation from datasets of NCEP/NCAR (a), NCEP/CFSR (b), RE-NCEP/NCAR (c), RE-NCEP/CFSR (d) and station observations (e) from 1979 to 2009

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Fig. 3 Relative errors (contour, unit: %) and correlation coefficient (shaded) between observations and RE-NCEP/NCAR (a), RE-NCEP/CFSR (b) reanalysis data from 1979 to 2009

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Fig. 4 Long-term variations of solar radiation in Chinese Mainland from 1963 to 2009(a) and monthly variations of solar radiation in Chinese Mainland from 1979 to 2009(b)

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图 5 海上太阳辐射资料的比较

(a) 太阳辐射海上观测与邻近陆上站点资料的相关系数，(b) 太阳辐射海上观测资料与邻近陆上站点资料、RE-NCEP/NCAR和RE-NCEP/CFSR资料调查区块平均值的比较

Fig. 5 Comparison of several solar radiation data sets over sea

(a) correlation of solar radiation between marine observations and land stations close to the sea, (b) comparison of regional average of solar radiation between marine observations and land stations close to the sea, RE-NCEP/NCAR and RE-NCEP/CFSR reanalysis data

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Table 1 Statistics of absolute errors between reanalysis data and observations

资料集	最大值/(W·m^-2)	最小值/(W·m^-2)	平均值/(W·m^-2)	标准差/(W·m^-2)	样本数
NCEP/NCAR	-108.22	-64.89	-81.60	11.95	15134
NCEP/CFSR	-123.18	-104.91	-113.51	4.49	316727
RE-NCEP/NCAR	26.42	-17.87	10.37	12.31	15134
RE-NCEP/CFSR	-51.76	-35.17	-42.68	4.19	316727
注：绝对误差的计算以台站资料为标准。

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Table 2 Statistics of absolute errors between reanalysis data and marine observations (unit: W·m^-2)

资料	最大值	最小值	平均值	标准差
NCEP/NCAR	-255.60	-132.58	-205.89	37.07
NCEP/CFSR	-273.79	-145.24	-219.75	38.88
RE-NCEP/NCAR	-207.67	-91.13	-161.19	35.36
RE-NCEP/CFSR	-231.93	-108.00	-179.66	37.30
注：绝对误差的计算以海上辐射观测资料为标准。

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